Any good coupon sites?

I’m going to use capital one shopping and perks at work to buy and resell stuff but was wondering if anyones knows of any other sites or apps out there. Tried groupon and rakuten but those aren’t stackable with what we have

submitted by /u/foxboy187
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source https://www.reddit.com/r/beermoney/comments/smcf40/any_good_coupon_sites/